corrected exception trace to stderr

scripts/mediawiki.py

@@ -436,7 +436,7 @@ def recentfiles (args):
                     break
             
             except APIError as e:
-                print ("Error {0}, skipping".format(e))
+                print ("Error {0}, skipping".format(e) ,file=sys.stderr)
 
         if args.limit and count == args.limit:
             break